Automatic stop mechanism for buttonhole-sewing machines.



No. 7:3,079. Patented Nov. II, 1902.. w

P. FABISCH.

AUTUMATIG STOP MECHANISM FOR BUTTONHOLE SEWING MACHINES.

(Application filed Jan. 30, 1902.)

(No Model.)

' 7 .avum

. 'fimrngy UNITE STATES ATENT OFFICE.

PHILIP FABISOH, OF BALTIMORE, MARYLAND.

AUTOMATIC STOP MECHANISM FOR BUTTONHOLE-SEWING MACHINES,

SPEGIFIGATION forming part of Letters latent No. 713,079, dated November 1 1, 1902.

Application filed January 30,1902. Serial No 91,821. (No model.)-

T0 aZZ whmn it nuty concern:

Be it known that I, PHILIP FABISCH, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements in Automatic Stop Mechanism forButton'nole-Sewing Machines, of which the following is a specificat-ion.

This invention relates to buttonhole-sewing' machines; and its object is to provide in a machine of this character an improved mechanism for automatically stopping the machine when the working of the buttonhole has been completed.

The invention consists in certain construc- Fig. 4 is a detail view of the clutch-actuating lever.

Referring to the drawings, A designatesthe bed-plate, and B the arm, of a buttonholesewing machine of the ordinary type, and C designates the table on which the machine is mounted.

Journaled in the machine-arm B is a horizontal driving-shaft D, which operates the feed-wheel E by means of the vibrating feedlever F and which also operates the other parts of the stitch-forming mechanism which it is not deemed necessary to fully illustrate or describe, as it forms no part of the present invention except in combination with the automatic stop mechanism. The said drivingshaft D is provided with a clutch mechanism comprising a fly-wheel ct, fast on said shaft,-

and a driving-pulley b, loose on said shaft and having a friction-face adapted to contactwith thefly-wheel. The driving-pulley, which is intended to be driven continuously by any suitable power, is pressed into frictional engagement with the fiy-wheel a by one of the upwardly-extending arms 0 of a Y-shape lever G, fulcrumed on a bracket cl, secured to the machine-arm B. The other upwardlyextending arm 0 of said lever carries a brake Fig. 2 is device 6, adapted for frictional engagement with the fly-Wheel to stop the driving-shaft at the same time the lever-arm c removes its pressure from the driving-pulley Z), and the downwardly-extending arm 0 0f said lever is secured to one end of a coil-spring f, whose other end is secured to the bed-plate A, the said spring tending to pull said lever into position to release the driving-pulley from the fly-wheel and to apply the brake device. In combination with these parts of the machine hereinbefore described I have provided an improved mechanism which will hold the clutch-operating lever G against the tension of the springfin position to press the driving pulley 1) against the fly-wheel 0, until the buttonhole has been Worked and which will then at once automatically allow the said spring to pull said lever, whereby to remove the pressure from the driving-pulleyand apply the brake to stop the machine. will now be described.

A lock-arm H is pivotally mounted on the lower face of the machine bed-plate A so as to move in a plane parallel with said face,

and said lock-arm is provided at its free end with a downwardlyprojecting lug h for a purpose presently described, and is also provided in thatside adjacent the face of the bed-plate with a notch or recess h, as best seen in Fig. 3. To the said lock-arm is pivotally connected one end of a rod 1 Whose other end projects out through a down-flange or rim of the bed-plate in juxtaposition to an adjustable bearing-head j on the end of the downwardly-extending arm 0 of the clutchoperating lever G, so that when said lockarm H is moved in a direction to push said rod the latter will move said clutch-operating lever G against the action of its spring, and thereby throw the clutch into position to start and operate the machine. In order to hold said lock-arm H-in the position necessary to operate the machine, as just described, a detent- It is provided. Said detent is also pivotally mounted at one end on the lower face of the bed-plate A between the lock-arm H and feedwheel E, and the other end of said detent extends into the notch h of said This mechanism loo vent the lock-bar from being moved in the reverse direction by the rod 2'. Intermediate of its ends the pivoted detent 7c is connected to one end of a link 1, whose other end is connected to a tripping-dog m, which is pivotally mounted on the lower face of the bed-plate A adjacent the feed-wheel E and which is provided with a nose m, which when the machine operates lies in the path of a shoulder 92 on the feed-wheel, so that when said shoulder comes into engagement with the said nose m the latter will be moved to swing the detent out of locking engagement with thelockarm H. A spring 0 is secured to the bedplate A and also to the said tripping-dog and tends to draw the latter into the path of said shoulder at, and also tends to draw the detent into position to readily take over the end of the notch 7t in the lock-arm H.

In order to retract the detent from locking engagement with the lock-arm H at any time independently of the feed-wheel, the said detent is provided at its catch end with a handle p, which extends upwardly through a slot q in the bed-plate within easy reach of the operator. 7

A bracketr is secured on the top of the table (1 just underneath the downwardly-extending lug of the lock-arm H. A foot-operated lever J is fulcrumed at s in said bracket, and its upper end is provided with a forked end If, meshing with said lug, and a wire it is secured to the lower end of said lever J and is also secured to a foot-treadle. (Not shown.) A spring o returns the lever J to its normal vertical position.

In practical operation the leverJ is rocked by the foot ofthe operator, and thereby moves the lock-arm H-in the present instance, to the left-which causes the projecting end of the rod 1' to push against the downwardly-extending arm 0 of the clutch-operating lever G, and thereby press the continuously-rotating driving-pulley 1) into frictional engagement with the fiy-wheel a on the driving-shaft D and cause the latter to rotate. At the same time the said movement of the lock-arm H permits the catch end of the detent 70, which rides on one wall of the notch h, to take over the far end of the latter, as shown in Figs. 2 and 3, as soon as the notch passes beyond the catch, thereby preventing said lock-arm from moving in the reverse direction and holding the rod 7; rigidly against the clutch-operating 1ever. In this manner the drive shaft D is caused to rotate. On account of the positive connection between the detent and trippingdog the latter will when the detent is moved into locking engagement with the lock-arm be swung into such position that its nose will lie in the path of the shoulder on the periphery of the feed-wheel E. The said shoulder is so located on the feed-wheel that j ust at the time the working of the buttonhole has been completed it (the shoulder) will contact with the nose of the dog and swing the latter so as to retract the detent from locking engagement with the lock-arm H, which will thus release said lock-arm and allow the coil-spring f to move the clutch-operating lever in a direction to stop the machine.

While the accompanying drawings illustrate one form of the invention, it is to be understood that changes in the details of construction may be made without departing from the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a buttonholesewing machine, the combination with the bed-plate, feed-wheel, and drive-shaft, of springreleased clutch mechanism fordrivingsaid shaft; a rod adapted to press against said clutch mechanism to move it into operative engagement with said shaft; a lock-arm pivotally mounted on the lower face of the bed-plate and connected to said rod and said lock-arm provided with a notch in its side adjacent the bed-plate; a foot-operated lever, J, adapted to move said lock-arm; a detent pivotally mounted on the lower face of the bed-plate and provided with a hooked end .mounted in the notch of said lock-arm and adapted to take over the end of said notch; a pivoted tripping-dog adapted to be actuated by the feed-wheel; a link connecting said dog to said detent; and a spring, 0, acting on said dog, as set forth.

2. In a buttonhole sewing machine, the combination with the feed-wheel and driveshatt,of spring-released clutch mechanism for driving said shaft; a rod adapted to press against said clutch mechanism to move it into operative engagement with said shaft; a pivoted lock-arm connected to said rod; adetent pivoted at one end and provided at its other end with a hook adapted to engage said lockarm; a pivoted tripping-dog arranged to be actuated by the feed-wheel; and a link connecting said tripping-dog with said detent, as set forth.

In testimony whereof I affix my signature in the presence of two witnesses.

PHILIP FABISCH.

Witnesses:

CHARLES L. VIETSCH, FREDERICK S. STITT. 

